• Topic ID: id_23554319
  • Version: 2.0
  • Date: Sep 26, 2020 10:13:42 PM

DAS Cooling Fans Replacement (RT)

Prerequisites

Overview

Replace faulty fan and clean DAS air plenum and filters:

  • Remove gantry covers

  • Remove DAS air plenum

  • Replace part

  • Clean filters and plenum

Procedure

  1. Position the table to its lowest position.
  2. Remove gantry right side cover.
    3. Notice Image
    • notice
    • Always turn OFF the HVDC before the 120 VAC. Turning OFF 120 VAC power before HVDC power can result in equipment damage.
  3. Turn OFF Axial Enable, HVDC, and 120VAC switches on the Service Switch panel.
  4. Remove gantry top and front covers.
  5. Position the DAS at 12 O’clock.
  6. Lock the gantry in position, using the rotational lock.
  7. Remove the DAS air plenum.
  8. Loosen the thumbscrew that holds the filter above the fan that is to be replaced, and remove the filter from the plenum.

    Figure 1. Remove Filter, Remove 3 Screws, Remove push-on connectors

  9. Remove the three (3) 3mm Hex screws and three (3) hex nuts that hold the fan in place.

    It is not necessary to remove the finger guard.

  10. Remove fan from plenum interior. If the support tube interferes with removal, then remove the bolt that holds the tube in place, and remove the tube.
  11. Unplug the two (2) push-on terminals. Needle-nose pliers can be used for this process.
  12. Connect push-on terminals to new fan, and place fan in plenum with airflow indicator pointing inward. Orient fan so that all three mounting holes align properly.
  13. Reattach fan to plenum, using the three (3) 3mm hex screws and hex nuts.

    Reinstall support tube, if applicable. Torque to 2.3 N-m (20.35 lbs-in).

  14. Inspect filter for dirt. Clean with a vacuum (or soap and water), if necessary, and reinstall. Secure the filter with the bracket and thumbscrew.
  15. Reinstall plenum.

    Figure 2. DAS Air Plenum Assembly

    note:

    For a larger version of the above illustration, click on the pdf icon below:

    Figure 3. DAS Air Plenum Assembly

    248732.pdf

Finalization

  1. Verify fans operate correctly.